docs: def fluid_synth_write_s16_stereo(synth, len):
      """Return generated samples in stereo 16-bit format.
  
      Return value is a Numpy array of samples.
      """
      import numpy
      buf = create_string_buffer(len * 4)
      fluid_synth_write_s16(synth, len, buf, 0, 2, buf, 1, 2)
      return numpy.fromstring(buf[:], dtype=numpy.int16)